diff --git a/bmi.rb b/bmi.rb
new file mode 100644
index 0000000..2d15286
--- /dev/null
+++ b/bmi.rb
@@ -0,0 +1,40 @@
+#!/usr/bin/env ruby
+# coding: utf-8
+
+require 'cgi'
+c = CGI.new(:accept_charset => "UTF-8")
+print "Content-type: text/html; charset=UTF-8\n\n"
+
+name = c["name"]
+var7 = c{"age1"}
+var8 = c{"age2"}
+var9 = c{"age3"}
+var1 = c["height1"]
+var2 = c["height2"]
+var3 = c["height3"]
+var4 = c["weight1"]
+var5 = c["weight2"]
+var6 = c["weight3"]
+
+height = (100 * var1.to_f + 10 * var2.to_f + var3.to_f) / 100
+weight = (100 * var4.to_f + 10 * var5.to_f + var6.to_f)
+
+bmi = weight / (height ** 2)
+1goodwei = height ** 2 * 22
+2goodwei = height ** 2 * 21.5
+
+print"
+BMI値
+\n"
+
+print"#{name}さんのBMI値
\n"
+
+print"身長:#{height}m
\n"
+print"体重:#{weight}kg
\n"
+printf("BMI:%3.1f (理想は女性:21.5、男性:22)
\n",bmi)
+printf("適正体重は%4.1fkgです(男性の場合)。
\n",height ** 2 * 22)
+printf("適正体重との比較は%±4.1fです。
\n"1goodwei - weight)
+printf("適正体重は%±4.1fkgです(女性の場合)。
\n",height ** 2 * 21.5)
+printf("適正体重との比較は%4.1fです。
\n"2goodwei - weight)
+print"\n"
+print"\n"